package com.poobo.utils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

/**
 * 
 * @author Nan 2015-11
 */
public class HttpClientUtil { 
    private static PoolingHttpClientConnectionManager cm;  
    private static String EMPTY_STR = "";  
    private static String UTF_8 = "UTF-8";  
      
    private static void init(){  
        if(cm == null){  
            cm = new PoolingHttpClientConnectionManager();  
            cm.setMaxTotal(50);//整个连接池最大连接数  
            cm.setDefaultMaxPerRoute(5);//每路由最大连接数，默认值是2  
        }  
    }  
      
    /** 
     * 通过连接池获取HttpClient 
     * @return 
     */  
    private static CloseableHttpClient getHttpClient(){  
        init();  
        return HttpClients.custom().setConnectionManager(cm).build();  
    }  
      
    /** 
     *  
     * @param url 
     * @return 
     */  
    public static String httpGetRequest(String url){  
        HttpGet httpGet = new HttpGet(url);  
        return getResult(httpGet);  
    }  
      
    public static String httpGetRequest(String url, Map<String, Object> params) throws URISyntaxException{  
        URIBuilder ub = new URIBuilder();  
        ub.setPath(url);  
          
        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  
        ub.setParameters(pairs);  
          
        HttpGet httpGet = new HttpGet(ub.build());  
        return getResult(httpGet);  
    }  
      
    public static String httpGetRequest(String url, Map<String, Object> headers,   
            Map<String, Object> params) throws URISyntaxException{  
        URIBuilder ub = new URIBuilder();  
        ub.setPath(url);  
          
        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  
        ub.setParameters(pairs);  
          
        HttpGet httpGet = new HttpGet(ub.build());  
        for (Map.Entry<String, Object> param: headers.entrySet()) {  
            httpGet.addHeader(param.getKey(), param.getValue().toString());  
        }  
        return getResult(httpGet);  
    }  
      
    public static String httpPostRequest(String url){  
        HttpPost httpPost = new HttpPost(url);  
        return getResult(httpPost);  
    }  
      
    public static String httpPostRequest(String url, Map<String, Object> params) throws UnsupportedEncodingException{  
        HttpPost httpPost = new HttpPost(url);  
        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  
        httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));  
        return getResult(httpPost);  
    }  
      
    public static String httpPostRequest(String url, Map<String, Object> headers,   
            Map<String, Object> params) throws UnsupportedEncodingException{  
        HttpPost httpPost = new HttpPost(url);  
          
        for (Map.Entry<String, Object> param: headers.entrySet()) {  
            httpPost.addHeader(param.getKey(), param.getValue().toString());  
        }  
          
        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  
        httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));  
          
        return getResult(httpPost);  
    }  
      
    private static ArrayList<NameValuePair> covertParams2NVPS(Map<String, Object> params){  
        ArrayList<NameValuePair> pairs = new ArrayList<NameValuePair>();  
        for (Map.Entry<String, Object> param: params.entrySet()) {  
            pairs.add(new BasicNameValuePair(param.getKey(), param.getValue().toString()));  
        }  
          
        return pairs;  
    }  
      
      
    /** 
     * 处理Http请求 
     * @param request 
     * @return 
     */  
    private static String getResult(HttpRequestBase request){  
        //CloseableHttpClient httpClient = HttpClients.createDefault();  
        CloseableHttpClient httpClient = getHttpClient();  
        HttpEntity entity=null;
        CloseableHttpResponse response=null;
        try{  
             response = httpClient.execute(request);  
            //response.getStatusLine().getStatusCode();  
             entity = response.getEntity();  
            if(entity!=null){  
                //long len = entity.getContentLength();// -1 表示长度未知  
                String result = EntityUtils.toString(entity);  
                return result;  
            }  
        }catch(ClientProtocolException e){  
            e.printStackTrace();  
        }catch(IOException e){  
            e.printStackTrace();  
        }finally{  
        	if(null!=entity){
        		try {
					EntityUtils.consume(entity);
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
        	}
        	
        	if(null!=response){
        		 try {
					response.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
        	}
        }  
          
        return EMPTY_STR;  
    }  
	public static void main(String[] args) throws  UnsupportedEncodingException {
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("params", "{\"phone\":\"18825235053\",\"useage\":4}");
		System.out.println(HttpClientUtil.httpPostRequest("http://localhost:8080/PeakeCloud/code/getCode", map));
	}

}